linux-kernel - [PATCH v15 clocksource 6/6] clocksource: Print deviation in nanoseconds for unstable case

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210527190124.440372-6-paulmck@kernel.org>
Date:   Thu, 27 May 2021 12:01:24 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, john.stultz@...aro.org,
        sboyd@...nel.org, corbet@....net, Mark.Rutland@....com,
        maz@...nel.org, kernel-team@...com, neeraju@...eaurora.org,
        ak@...ux.intel.com, feng.tang@...el.com, zhengjun.xing@...el.com,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH v15 clocksource 6/6] clocksource: Print deviation in nanoseconds for unstable case

From: Feng Tang <feng.tang@...el.com>

Currently when an unstable clocksource is detected, the raw counters
of that clocksource and watchdog will be printed, which can only be
understood after some math calculation.  So print the existing delta in
nanoseconds to make it easier for humans to check the results.

[ paulmck: Fix typo. ]
Signed-off-by: Feng Tang <feng.tang@...el.com>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/time/clocksource.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index bbe1bcf44ffa..4485635b69f5 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -406,10 +406,10 @@ static void clocksource_watchdog(struct timer_list *unused)
 		if (abs(cs_nsec - wd_nsec) > md) {
 			pr_warn("timekeeping watchdog on CPU%d: Marking clocksource '%s' as unstable because the skew is too large:\n",
 				smp_processor_id(), cs->name);
-			pr_warn("                      '%s' wd_now: %llx wd_last: %llx mask: %llx\n",
-				watchdog->name, wdnow, wdlast, watchdog->mask);
-			pr_warn("                      '%s' cs_now: %llx cs_last: %llx mask: %llx\n",
-				cs->name, csnow, cslast, cs->mask);
+			pr_warn("                      '%s' wd_nsec: %lld wd_now: %llx wd_last: %llx mask: %llx\n",
+				watchdog->name, wd_nsec, wdnow, wdlast, watchdog->mask);
+			pr_warn("                      '%s' cs_nsec: %lld cs_now: %llx cs_last: %llx mask: %llx\n",
+				cs->name, cs_nsec, csnow, cslast, cs->mask);
 			if (curr_clocksource == cs)
 				pr_warn("                      '%s' is current clocksource.\n", cs->name);
 			else if (curr_clocksource)
-- 
2.31.1.189.g2e36527f23